I saw it today, and really enjoyed it. I liked how they effortlessly went from serious and dramatic to slapstick, often multiple times in the same scene.
I've seen some criticism online against the movie's treatment of Janet van Dyne, and I'll put my comments on that behind spoiler tags:
[sblock]The criticism is based on how Janet is killed off before the movie even starts, and done so just to give background to Hank Pym's character - essentially, the classic "woman in refrigerator" theme. Also, how Hope is sidelined for most of the movie when she's really the most qualified person for the job.
I would disagree with these assessments. First, I'm like 95% certain that Janet's going to make an appearance in the sequel. Her "death" was as comic-booky as it gets, leaving no body behind, and we do get to see Scott return from the same fate. Also, we never got to see her face in pictures or flashbacks. That means that they intend to cast someone in that role, but haven't done so yet (and it's likely they'll look for a fairly big-name actor).
As for Hope, I'm somewhat more sympathetic to those sentiments. She is really more qualified than Scott - she's a better fighter, she's smarter, and she knows more about the suit and principles involved. But Hank's reasons for keeping her out also ring true - he still sees his little daughter, and doesn't want her to get hurt. What's more, he eventually realizes that he's wrong, and enlists her aid in finishing Janet's new suit for her - one with Wasp-style wings, I might add.[/sblock]